What does the contactor do in AC unit?
A contactor is an electrical relay that controls the flow of electricity to components in the AC unit. The contactor sends voltage to the condenser and outdoor fan motor. Voltage from the thermostat is sent to the contactor and is registered by the contactor’s side terminals.Click to see full answer. Keeping this in consideration, what happens when AC contactor goes bad? The Contactor Contactors can fail electrically or mechanically. A sign of failure on a contactor is that the condenser unit will not shut off even if the thermostat is set to power off. And mechanical failure can happen if something has gotten into it such as pests or debris that prevent it from working.One may also ask, what causes a contactor to go bad? Electrical failure – Three different electrical issues can cause contactor failure. The insulation between the coil wires can break down and cause a short. The coil can become grounded through another metal component when the wiring insulation deteriorates. The coil can also become stuck in an open position. Likewise, people ask, how much does it cost to replace an AC contactor? AC Service Call, Parts, Time and Installation Cost Repair Task Part Cost Cost Installed Replace Circuit Breaker $25-$65 $110-$180 Thermostat Replacement $80-$220 $140-$325 Replacement AC Contactor $25-$75 $110-$225 Air Conditioner Capacitor $25-$45 $100-$225 What causes contactor to burn out?MaxHeadRoom. If you supply an AC contactor coil with less than rated voltage you risk the burn out due to the armature not able to fully engage.
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